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Oracle "alter table" drop column

Syntax example

Oracle Database Tips by Donald Burleson

You can use the Oracle "alter table" syntax to drop any column from a table, as shown in this example:

alter table
drop column
   col_name1;  -- drop ONE column
alter table
   (col_name1, col_name2);  -- drop MANY columns

We have "alter table" syntax to drop multiple data columns in-place in this form:

alter table

Here are some examples of Oracle "alter table" syntax to drop data columns.

alter table
drop column

Remember, when you drop a table column the column space remains used inside the data blocks and you may want to reorganize the table (using the dbms_redefinition package) to reclaim the free spaced from the dropped table column.



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